Design of a spatially resolved T/sub I/ diagnostic system for EBT-S

A diagnostic neutral beam system is being designed to provide spatially resolved measurements of T/sub I/ on EBT-S. This installation will be the first step toward testing neutral beam heating in an EBT geometry and must be designed to be compatible with the intense microwave environment (isolation) and with the steady-state nature of EBT (particle control). The beam system will inject an intense (approx. .300 mA/cm/sup 2/) monoenergetic neutral beam (approx. .5 cm diam) perpendicular to the lines of sight of an existing four-channel charge exchange neutral analyzer. The resolution volume, defined as the intersection volume of beam and detector-line-of-sight will be approx. 1 cm/sup 3/. The beam source will be a 20 kV single aperture reflex arc (SARA) source. The system is being designed to operate either steady state or chopped at 50% duty cycle for long-time synchronous detection. Design criteria for selection of source parameters and anticipated results will be discussed